Warp let-off attachment



g- 15, H. 1. HANSEN ET AL ,871,517

WARP LET-OFF ATTACHMENT Filed Sept. 19, 1929 2 Sheets-Sheet l l I l INVEN TORS & I HEFBE/fl'l. HANSEN JOHN Aw/lwflc/ls BY f N V W ATTORNEY.

Aug. 16, 1932. H. l. HANSEN T AL I 1,371,517

WARP LET-OFF [{TTACHMENT Filed Sept. 19, 1929 2 Sheets-Sheet 2 PatentedAug. 16, 1932 v STAT-ES PATENT OFFICE HERBERT I. Hansen AND JOHN A. ,HINRIcHs, or rnrnnsoiv, NEW JERSEY; SAID HINRICHS ASSIGNOR T0. sArnI-IANSEN WARP LET-OFF ATTACHMENT Application filed September 19,1929.Serial No. 393,755.

This invention appertains to looms, and

more particularly to a novel attachment for looms designed toautomatically and positively release the Warp from the warp beam or rollwith every pickof the loom, thereby preventing such defects which appearin the weaving of cloth incident to" the warp not being fed properly. 7In looms now generally in 10 beam or roll is provided with a flange oneach end of the same on which thereis a rope wound around a' number oftimes and held tight by cast iron loom weights. 'Thes'e weights areslipped on the rope as required by the weaver; dilferent kinds of silkand other cloth have different amounts of weights so as to keep the warptight, thereby making the loom pull the silk or woolen against thefriction of the rope. The main difficulty with the use of the ropehas'been that due to the climatic conditions, the rope would have atendency to stick on the warp beam or roll and instead of moving acertain amount for each pick of the loom, it would hold for two or threepicks, then release and jump a large distance all at once, which willshow a mark in the finished cloth, due to the releasing of the tensionon the warp. Certain devices have been formulated with the end in viewto prevent the friction rope from sticking on the flanges of the warpbeam or roll, but these devices have notbeen positive in their operationand are not practical and will not operate satisfactorily for any lengthoftime. iv

There are any number of other types of let-off motions 0n the market atthe present time, all attempting to eliminateithe' rope, but with verylittle success, because the price of these articles is prohibitive andentirely too complicated. n

It is, therefore, one of the primary objects of our invention to providea positive means actuated from a workingpart of the loom for disturbingthe tension of the friction rope on each pick of the loom and therebyinsuring a positive release of the warp from the warp'beam regularly andin'the exact length required. r t 50 Another important object of ourinvenuse, the warp tion is the provision of a tap rod slidable on theframe ofthe loom actuated preferably by the laybeam with means operatedby the tap rod for disturbing the tension of the friction rope, whichmakes it impossible for the rope to stick at any timeregardless of cli--mate or wear of the rope. U a

' Anotherimportant object of our invention is the provision of a novelratchet de-.

vice arranged between the tap rod and. the clamp for engaging the rope,which permits these parts tobe adjusted'so as to overcome the difierencein the length of the rope due to the stretch'ofthe same. This isespecially desirable whennew rope is installed and which hasconsiderable stretch.

A further important object of our invention is theprovisi'on of novelmeans for setting the tap rod whereby, the tap from the lay beamwillonly be transferred to the rope to the extent of the amount ofpre-set of said tap rod. I i

A still further'object of our invention is to provide a device of theabove character which can be incorporated with a loom ofcon'ven-' tionalcharacter without any change in design thereof, the attachment beingessentially simple and durable in construction and one which can bemanufactured at a very low cost,

With these'and other objects in view, the invention consists in thenovel construction, arrangement and formation of parts as will behereinafter more specifically described,

claimed and illustrated in the accompanying I drawings,in whichdrawings: Figure 1- 's a side elevation of our improved device showingthe same applied to a conventional loom, the loom being shown fragmentarily and in light lines and in dash lines;

*Figure'Q is an end elevation of our novel device showing the sameengaging the fric tion rope of the warp beam or roll; Figure 3 is adetail sectional View illustrating the connection between the tap rodand the clamping means for engaging the friction rope; 1 i

Figureit is a detail perspective view illus- V trating one of theholding and guide brackets for the tap rod, and

V Figure 5 is'a-detail verticalfsectionillustrating the means ofconnection of onepart of the ratchet device to the friction rope.

Referring to the drawings in detail, wherein similar referencecharacters designate corresponding parts throughout the several views,the letter A generally-indicates our improved attachment for the'loom B.The loom B can be of any preferred character or type and includes theusual frame 10 having the lay beam 11 actuated in the ordinary mannerand the warp beam or "roll 12 for re ceiving the warp of the fabricbeing woven. The warp roll or beam in accordancei'vith'the usualconstruction, is flangedto provide a coiled the friction rope 14:. Theopposite ends of the friction'rope receive respectively loom weights 15and 16, which are slipped on the rope as required by the weaver,different kinds of fabric requiring different amounts of weight. It iswell to note in the present instance that the weight 16 can beeliminated and-the ends of the rope which ordinarily receive-theseweights can :be tied'to the loom frame and this practice is common inthe weaving-art. Our-device which will be presently described isparticularly adapted to the friction ropes when the-same are tied totheloom 1O andwe desire to stress this point view of the fact that certainother structures within our knowledge, which attemptto disturb thetension of the friction rope without positive means will not functionwhere-one end of the rope is tied. Also our attachment is particularlyadapted to looms for weaving broad silk, but it is to be understood thatthe attachment is adaptable for other kinds of fabric being woven.

Our improved-attachment comprisesza tap rod 20 which extendslongitudinally of the loom 'frame, and. this tap rod includes the frontrod section 21 and the back rodsection 22, and thesesections 21 and 22are adj ustably connected by means of a turnbuckle 23.. A

jam nut 24 can be employed for holding the turnbuckle nut againstaccidental movement. The tap rod is slidably mounted in suitablebrackets 25 and 26 carried by the frame of the loom and each of thesebrackets include at.- taching plates 27 bolted or otherwise secured tothe loom frame, and an outwardly extending supporting rod 28. Thissupporting rod 28 has adjustably mounted thereon a slide bracket 29which in turn adjustably carries 'a' depending supporting arm 30. "Thelower end of each arm :30 carries a cap 31' having adjustably mountedthereon for swinging movementthecol-lar or sleeve 32 through whichextends the tap rod. The forward endof the tap rod section 21 isprovided with a hammer cap 33 which can be provided with a wear andcushioning pad :34. This pad or plug 34: can be made of rawhide and thehammer cap 33 with its plug is arranged inzthe pathof the laybeam' '11so that the nod-21- will be tapped ratchet-shoe 35 the side walls 36 ofwhich formguides forengaging the opposite sides of the arcuate rack orratchet bar 37 which is adapted to engage over the friction rope. ,Theopposite side of the arcuate rack or drum, pulley or the like13, aroundwhich is ratchet bar 37 carries guide wheels 38 for engaging the flangesor sides of the drum or pulley of the warp beam or roll.

These clamping j-awsare adapted to grip one convolution of the frictionrope 14. An adjusting bolt extends-through theclamping jaws 40 and 41and through the ear 39 and forms means for bringing the jaws in firm.clamping contact with the convolution ofthe friction rope 14., Thus, itcan be seen that the arcuate rack or ratchet bar 37 isfirmly clampedwith the friction rope. The ratchet shoe 35 pivotally supports a 1weighted dog or dogs 43 having adepending tooth 44 for engaging anadjacent toot-h ofthe arcuate :rackor rack bar 37.

.From the description so far it ,can be seen that our-device operates asfollows :On each 'pickof the loom the lay beam 11 will'push the ferredtetheropecl-amp through the ratchet device. This makes it impossible-forthe-rope to stick negardlesspf climate or wear of the rope. .Should'therope stretch at any time, the ratchet or rack bar 37 will simply movewith therope and the weighted dogs will still be enabled to engage an,adjacent ratchet tooth, thereby eliminating :all difficulty the changingof position of the rope clamp due to the stretch ofthe rope.

Another important feature of our invention is the-provision nf means forsetting the tap rod so'that the :lay of'the loom will transfer the t-apto the repeat the proper time and only to the extent :of the amount ofthemeset. This setting mechanism embodies spaced collars 45 and 46 whichare-keyed or otherwise secured in spaced :relation to the tap rod 20 onopposite sides of the guide sleeves 32 of the bracket '26. An expansionspring 47 is placed about the 'tapro-da-nd engages" the guide sleeve :32and the collar 46. It isobvious that this spring functions to return thetap .rodto its normal position, at each operation thereof by the lay,and that by ;adjusting the position of the collars 45 :and .46

the movement of the tap -rod 20 and the tension of the spring can be reulated.

Changes in details may be made without departing from the spirit or thescope of this invention, but what we claim as new is:

1. A loom attachment comprising in combination with the warp roll orbeam, a rope v coiled about said beam, a clamp carried by one of theconvolutions of the rope, a longitudinally movable tap rod positivelyactuated on each pick of the loom for engaging said clamp to disturb thetension of the rope, and a rc'latchet device between the clamp and tapro 2. A loom attachment comprising in combination with the warp roll orbeam, a tension rope looped about said beam and a lay beam, alongitudinally movable tap rod disposed in the path of the lay beam andactuated thereby, and means for transferring the movement of the tap rodto the rope.

3. A loom attachment comprising in combination with the warp roll orbeam, a tension rope looped about said beam and a lay beam, alongitudinally movable tap rod disposed in the path of the lay beam andactuated thereby, means for transferring the movement of the tap rod tothe rope, and means for initially adjusting the tap rod relative to thelay eam.

4. A loom attachment comprising in combination with the loom frame, awarp roll,

and a lay beam, a tensioned rope looped about the said warp roll, guidebrackets secured to the loom frame, a tap rod slidably mounted in theguide brackets and disposed in the path of the lay beam and adapted tobe actuated thereby, and means for transmit- I ting the motion of thetap rod to the ten-' sioned rope.

5. A loom attachment comprising in com bination with the loom frame, alay beam and a warp roll, a weighted rope looped about the end of thewarp roll, guide brackets secured to the loom frame, a tap rod slidablymounted in the brackets and disposed in the path of the lay beam andadapted to be actuated thereby, means for transmitting the movement ofthe tap rod to the rope, stop collars adjustably mounted on the tap rodand installed on opposite sides of one of the brack' ets, and anexpansion spring coiled about the tap rod and engaging one of thecollars and one of the brackets.

6. A loom attachment comprising in com- 7 weighted dog for engaging theteeth f the ratchet bar.

7 As a new article of manufacture, a letoff attachment for loomscomprising a pair of adjustable brackets, brackets, a hammer cap carriedby oneend of the rod, a ratchet shoe carried by the opposite end of therod, an arcuate rack bar, a rope clamp carried by the rack bar, meansfor adjusting the active length of the tap rod, adjustable collarssecured to the tap rod on each side of one of the brackets, and a coilspring and tap rod disposed between one of the collars and'the adjacentbracke v In testimony whereof we aifix our signatures.

HERBERT I. HANSEN.- JOHN A. HINRICHS.

a tap rod slidable in said

